Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c186c5c4c6a5c5d…

MALICIOUS

PDF

79.3 KB Created: 2021-02-27 11:27:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15822e908c0f03300cd188145e5bdcd0 SHA-1: d757226722b4cdb89da245b55494e447721e4f45 SHA-256: 4c186c5c4c6a5c5df883b468515bd3f5fbefed58e79f2c17356543ebb9b2c845
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://zajinet.ru/aws?utm_term=how+to+train+chest+with+ac+joint+injury', which is likely part of a phishing or credential harvesting scheme. The presence of multiple unknown reputation URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/aws?utm_term=how+to+train+chest+with+ac+joint+injury
    • http://teasmall.space/26113703774lvmyv.pdf
    • https://static.s123-cdn-static.com/uploads/4494668/normal_60013c9719e6d.pdf
    • http://nasporte1.fun/honda_dw1_transmission_fluid_equivalenta6all.pdf
    • http://topsol.xyz/aami_bmet_study_guiderxaax.pdf
    • http://takujol.iblogger.org/hybrid_flowers_acnl_guide.pdf
    • http://roman-holidays.shop/ions_equation_worksheetfryyj.pdf
    • http://aarbuz.space/tibazarovuvjcf9t.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vijijowop.epizy.com/bexej.pdf
    • http://vorisenunajix.myartsonline.com/side_by_side_book_2_activity_workbook_download.pdf
    • https://s3.amazonaws.com/rafiralexezol/puxutijo.pdf
    • https://s3.amazonaws.com/liwara/ayyappa_swamy_naa_songs_free.pdf
    • http://fefomuk.epizy.com/dogafovitupu.pdf
    • http://jufamupubo.epizy.com/v_for_vendetta_mask_hackers.pdf
    • https://s3.amazonaws.com/vufuzewasi/vokulezonumamosubija.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e8.bin
c51784161dc337b9b52e65b99f7b246f9810bbb858074ae7e67af266113ecf48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 5088 bytes
font_01_sfnt_off00010a43.bin
30630e11e7641813ac4f1636fe1da2dbdfb7e4a08d2e6de4a3e89b96f8038a04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A43 11040 bytes

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